Eckx's profile

Regular Visitor

 • 

7 Messages

Tue, Dec 8, 2020 9:00 AM

Correctables?

How many correctables are "normal"? I know in a perfect world there would be zero, but I am getting millions an hour. I already called tech support, and they have a back end tech looking into my connection, but I just wanted to try and understand more of what I am looking at on my Modem's status screen. 

 

Connection

The status listed show the connection state of the cable modem. They are used by your service provider to evaluate the operation of the cable modem.

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel405000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+
DOCSIS Network Access EnabledAllowed 

 
Downstream Bonded Channels
Channel IDLock StatusModulationFrequencyPowerSNR/MERCorrectedUncorrectables
42LockedQAM256405000000 Hz3.0 dBmV40.9 dB00
1LockedQAM256459000000 Hz2.6 dBmV40.9 dB00
2LockedQAM256465000000 Hz2.5 dBmV40.9 dB00
3LockedQAM256471000000 Hz2.7 dBmV40.9 dB00
4LockedQAM256477000000 Hz3.0 dBmV40.8 dB00
5LockedQAM256483000000 Hz3.0 dBmV40.7 dB00
6LockedQAM256489000000 Hz3.0 dBmV40.8 dB00
7LockedQAM256495000000 Hz3.2 dBmV40.8 dB00
8LockedQAM256501000000 Hz3.4 dBmV40.8 dB00
9LockedQAM256507000000 Hz3.4 dBmV40.8 dB00
10LockedQAM256513000000 Hz3.1 dBmV40.6 dB00
11LockedQAM256519000000 Hz2.8 dBmV40.6 dB00
12LockedQAM256525000000 Hz2.6 dBmV40.6 dB00
13LockedQAM256531000000 Hz2.4 dBmV40.6 dB00
14LockedQAM256537000000 Hz2.2 dBmV40.5 dB00
15LockedQAM256543000000 Hz2.1 dBmV40.6 dB00
16LockedQAM256549000000 Hz1.8 dBmV40.4 dB00
17LockedQAM256555000000 Hz1.9 dBmV40.4 dB00
18LockedQAM256561000000 Hz2.2 dBmV40.4 dB00
19LockedQAM256567000000 Hz2.2 dBmV40.4 dB00
20LockedQAM256573000000 Hz2.3 dBmV40.6 dB00
21LockedQAM256579000000 Hz2.4 dBmV40.6 dB00
22LockedQAM256585000000 Hz2.4 dBmV40.7 dB00
23LockedQAM256591000000 Hz2.3 dBmV40.6 dB00
37LockedOther690000000 Hz3.2 dBmV36.8 dB60436630
38Not LockedQAM2560 Hz0.0 dBmV40.8 dB00
39LockedQAM256435000000 Hz2.9 dBmV40.6 dB00
40LockedQAM256441000000 Hz2.4 dBmV40.8 dB00
41LockedQAM256447000000 Hz2.6 dBmV40.8 dB00
43LockedQAM256453000000 Hz2.7 dBmV40.5 dB00
44LockedQAM256411000000 Hz3.1 dBmV40.8 dB00
45LockedQAM256417000000 Hz3.1 dBmV40.8 dB00



 
Upstream Bonded Channels
ChannelChannel IDLock StatusUS Channel TypeFrequencyWidthPower
13LockedSC-QAM Upstream22800000 Hz6400000 Hz40.0 dBmV
21LockedSC-QAM Upstream35600000 Hz6400000 Hz40.0 dBmV
32LockedSC-QAM Upstream29200000 Hz6400000 Hz40.0 dBmV
44LockedSC-QAM Upstream16400000 Hz6400000 Hz39.0 dBmV
55LockedSC-QAM Upstream39600000 Hz1600000 Hz39.0 dBmV



 

Current System Time: Tue Dec 8 12:36:11 2020



 

Connection

The status listed show the connection state of the cable modem. They are used by your service provider to evaluate the operation of the cable modem.

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel405000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOK 
SecurityEnabledBPI+
DOCSIS Network Access EnabledAllowed 

 
Downstream Bonded Channels
Channel IDLock StatusModulationFrequencyPowerSNR/MERCorrectedUncorrectables
42LockedQAM256405000000 Hz3.0 dBmV39.4 dB00
1LockedQAM256459000000 Hz2.6 dBmV40.9 dB00
2LockedQAM256465000000 Hz2.5 dBmV40.9 dB00
3LockedQAM256471000000 Hz2.7 dBmV40.9 dB00
4LockedQAM256477000000 Hz3.0 dBmV40.8 dB00
5LockedQAM256483000000 Hz3.1 dBmV40.8 dB00
6LockedQAM256489000000 Hz3.1 dBmV40.7 dB00
7LockedQAM256495000000 Hz3.2 dBmV40.7 dB00
8LockedQAM256501000000 Hz3.4 dBmV40.7 dB00
9LockedQAM256507000000 Hz3.4 dBmV40.8 dB00
10LockedQAM256513000000 Hz3.1 dBmV40.8 dB00
11LockedQAM256519000000 Hz2.9 dBmV40.6 dB00
12LockedQAM256525000000 Hz2.6 dBmV40.7 dB00
13LockedQAM256531000000 Hz2.4 dBmV40.6 dB00
14LockedQAM256537000000 Hz2.3 dBmV40.5 dB00
15LockedQAM256543000000 Hz2.1 dBmV40.5 dB00
16LockedQAM256549000000 Hz1.8 dBmV40.4 dB00
17LockedQAM256555000000 Hz1.9 dBmV40.4 dB00
18LockedQAM256561000000 Hz2.2 dBmV40.5 dB00
19LockedQAM256567000000 Hz2.2 dBmV40.4 dB00
20LockedQAM256573000000 Hz2.3 dBmV40.5 dB00
21LockedQAM256579000000 Hz2.4 dBmV40.5 dB00
22LockedQAM256585000000 Hz2.4 dBmV40.6 dB00
23LockedQAM256591000000 Hz2.2 dBmV40.5 dB00
37LockedOther690000000 Hz3.2 dBmV38.8 dB82304760
38Not LockedQAM2560 Hz0.0 dBmV40.8 dB00
39LockedQAM256435000000 Hz2.8 dBmV40.7 dB00
40LockedQAM256441000000 Hz2.4 dBmV40.8 dB00
41LockedQAM256447000000 Hz2.6 dBmV40.8 dB00
43LockedQAM256453000000 Hz2.7 dBmV40.8 dB00
44LockedQAM256411000000 Hz3.1 dBmV40.9 dB00
45LockedQAM256417000000 Hz3.1 dBmV40.7 dB00



 
Upstream Bonded Channels
ChannelChannel IDLock StatusUS Channel TypeFrequencyWidthPower
13LockedSC-QAM Upstream22800000 Hz6400000 Hz40.0 dBmV
21LockedSC-QAM Upstream35600000 Hz6400000 Hz40.0 dBmV
32LockedSC-QAM Upstream29200000 Hz6400000 Hz40.0 dBmV
44LockedSC-QAM Upstream16400000 Hz6400000 Hz39.0 dBmV
55LockedSC-QAM Upstream39600000 Hz1600000 Hz39.0 dBmV



 

Current System Time: Tue Dec 8 12:36:34 2020




Here are 2 snapshots from my status screen, 23 seconds apart. In that time I had 2,186,813 correctable errors. What does this mean? I assume this is high based on some other posts I have looked at, but I don't quite understand what exactly it means. Is there anyone on here who might be able to explain it more?

Responses

EG

Expert

 • 

87.2K Messages

6 m ago

The stats are good. FWIW, channel 37 marked as (Other) is the DOCSIS 3.1 / OFDM channel. It is used for the delivery of their gigabit speeds. There is a known glitch with some makes / models of modem's firmware where the measuring mechanism incorrectly reads the power level, the SNR, and the bit errors for that channel. So it reads many errors when there really aren't. It's normal.

 

I don't see any "Uncorrectable" bit errors. They would be more of a problem than the corrected errors.

 

Are you actually experiencing any connectivity problems ? If not, don't sweat it.

Regular Visitor

 • 

7 Messages

6 m ago

Yes, I have been having intermittent issues. This was actually after a modem reset, right after it came online. I plugged the power cable back in to the modem at 12:34pm. It's an ARRIS SB8200, which other people have posted using the same modem, and have had nowhere near the amount of correctables. 

My internet will drop out for a minute here, minute there. Come back, and then do the same thing after a few minutes, or even a few hours. I have a simple ping monitor set up. Yesterday my connection was restored at 11:08am, and didn't drop out again until 8:54pm, but then it dropped out every few minutes until just after 10pm, making the internet pretty much unusable for anything besides scrolling Facebook. My son couldn't stay connected on his Xbox, my daughter was on a Zoom call that dropped, and my wife and I were watching Netflix and it started buffering every 30 seconds. 

It's random, I can't seem to get it to reproduce by doing anyhting on my end, but it keeps happening. I checked all the connections from the wall plate, even removing it and making sure the cable was snug to the plate, and then snug from the plate to the modem as well. I even preformed a factory reset on my Modem. Symptoms still happened with my laptop plugged directly into my modem, eliminating the rest of my network from the problem. It started Saturday night and persists currently. 

This had happened before and a technician came out and redid my connection at the pole and the problem was fixed, until now. I am not sure if it's the same cause, but I recall the tech saying something about too many correctables happening. That was also when I still had an Xfinity Xfi Gateway. I have had the ARRIS modem since February with zero issues until Saturday evening. 

EG

Expert

 • 

87.2K Messages

6 m ago

O/k. Are there any error log entries being shown ? If so, please post them as well.

Regular Visitor

 • 

7 Messages

6 m ago

Ah, thank you. As I had said earlier, I had called Tech support last night and they had opened a ticket with the back end techs to check my connection. I was just trying to make sense of what I was looking at here. Whenever I googled the information, it always just led me to the Xfinity Forums, so I figured I would try and ask.

I guess my main question was what are the correctable/ uncorrectable entries about? Are they bad packets? Or is it something else?

EG

Expert

 • 

87.2K Messages

6 m ago

The signal stats are o/k but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

 

I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

Regular Visitor

 • 

7 Messages

6 m ago

Connection stabalized again, this is the current Line 37 entry

37LockedOther690000000 Hz2.8 dBmV26.2 dB6320998801615

Regular Visitor

 • 

7 Messages

6 m ago

This is the event log: 

Event Log

The table below contains the log of events that the SB8200 has detected. This log can be important to the service provider to help diagnose and correct problems, if any should occur.

Date Time Event ID Event Level Description
12/08/2020 14:21820005003"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 14:08740101006"CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 14:07740101006"CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 14:06740101006"CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 14:05740101006"CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 13:56740101006"CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 13:54740101006"CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 13:53740101006"CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 13:53740101006"CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 12:35820005003"Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/08/2020 12:35670616006"DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:0024366940666"Honoring MDD; IP provisioning mode = IPv6"
01/01/1970 00:00820002003"No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00840001003"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00820002003"No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00840001003"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
12/07/2020 22:2824366940443"Resetting the cable modem due to docsDevResetNow"
01/01/1970 00:00820002003"No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00840001003"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
12/07/2020 22:2124366940443"Resetting the cable modem due to docsDevResetNow"
12/07/2020 22:13820002003"No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
12/07/2020 22:13840005003"SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:02820002003"No Ranging Response received - T3 time-out;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:01:5c:7a:0a:50;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01840001003"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00840001003"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=14:c0:3e:02:11:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"



Also this is an updated status log, I was able to catch my internet acting up and get this in the middle of it: 

Downstream Bonded Channels
Channel IDLock StatusModulationFrequencyPowerSNR/MERCorrectedUncorrectables
42LockedQAM256405000000 Hz3.0 dBmV40.8 dB00
1LockedQAM256459000000 Hz2.6 dBmV40.7 dB00
2LockedQAM256465000000 Hz2.5 dBmV40.9 dB00
3LockedQAM256471000000 Hz2.6 dBmV40.8 dB00
4LockedQAM256477000000 Hz3.0 dBmV40.8 dB00
5LockedQAM256483000000 Hz3.1 dBmV40.7 dB00
6LockedQAM256489000000 Hz3.1 dBmV40.7 dB00
7LockedQAM256495000000 Hz3.3 dBmV40.7 dB00
8LockedQAM256501000000 Hz3.4 dBmV40.7 dB00
9LockedQAM256507000000 Hz3.4 dBmV40.8 dB00
10LockedQAM256513000000 Hz3.1 dBmV40.7 dB00
11LockedQAM256519000000 Hz2.9 dBmV40.6 dB00
12LockedQAM256525000000 Hz2.6 dBmV40.7 dB00
13LockedQAM256531000000 Hz2.5 dBmV40.5 dB00
14LockedQAM256537000000 Hz2.3 dBmV40.5 dB00
15LockedQAM256543000000 Hz2.1 dBmV40.6 dB00
16LockedQAM256549000000 Hz1.9 dBmV40.5 dB00
17LockedQAM256555000000 Hz2.0 dBmV40.5 dB00
18LockedQAM256561000000 Hz2.2 dBmV40.4 dB00
19LockedQAM256567000000 Hz2.3 dBmV40.4 dB00
20LockedQAM256573000000 Hz2.3 dBmV40.7 dB00
21LockedQAM256579000000 Hz2.5 dBmV40.6 dB00
22LockedQAM256585000000 Hz2.5 dBmV40.7 dB00
23LockedQAM256591000000 Hz2.3 dBmV40.7 dB00
37LockedOther690000000 Hz2.8 dBmV35.5 dB611363805567
38Not LockedQAM2560 Hz0.0 dBmV40.7 dB00
39LockedQAM256435000000 Hz2.9 dBmV40.7 dB00
40LockedQAM256441000000 Hz2.5 dBmV40.8 dB00
41LockedQAM256447000000 Hz2.7 dBmV40.8 dB00
43LockedQAM256453000000 Hz2.7 dBmV40.9 dB00
44LockedQAM256411000000 Hz3.1 dBmV40.9 dB00
45LockedQAM256417000000 Hz3.1 dBmV40.8 dB00



 
Upstream Bonded Channels
ChannelChannel IDLock StatusUS Channel TypeFrequencyWidthPower
13LockedSC-QAM Upstream22800000 Hz6400000 Hz40.0 dBmV
21LockedSC-QAM Upstream35600000 Hz6400000 Hz41.0 dBmV
32LockedSC-QAM Upstream29200000 Hz6400000 Hz40.0 dBmV
44LockedSC-QAM Upstream16400000 Hz6400000 Hz39.0 dBmV
55LockedSC-QAM Upstream39600000 Hz1600000 Hz39.0 dBmV



 

Current System Time: Tue Dec 8 14:23:42 2020



ComcastChe

Official Employee

 • 

6.1K Messages

6 m ago

Hi @Eckx! Thanks for the screenshots of your logs. I agree with @EG. I can investigate your connectivity issues while checking to see if an additional IP Address is available for you. I've got your private message and will be replying shortly. 

EG

Expert

 • 

87.2K Messages

6 m ago

Damaged / corrupted bits.

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